Abstract: A rearview mirror includes a shell with an opening, a display light-emitting structure installed in the shell, a protective structure and a reflective polarizing structure installed at the opening. The reflective polarizing structure is a single layer made of both reflective material and polarizing material, the protective structure comprises an outer glass layer, the outer glass layer, the reflective polarizing structure, and the display light-emitting structure are laminated in sequence, and the reflective polarizing structure is attached to one of the outer glass layer and the display light-emitting structure. The rearview mirror has a simple structure, less light loss, and good display quality.

Abstract: A cycling helmet capable of switching a sound production guidance mode based on a bone conduction earphone includes: a helmet body and the bone conduction earphone disposed on the helmet body. The bone conduction earphone includes a magnet, a coil and a bone conduction oscillator, and the bone conduction oscillator can contact the helmet body, so as to cause the helmet body to oscillate to form a sound cavity.

Abstract: A cycling helmet capable of switching a sound production guidance mode based on a bone conduction earphone includes: a helmet body and the bone conduction earphone disposed on the helmet body. The bone conduction earphone includes a magnet, a coil and a bone conduction oscillator, and the bone conduction oscillator can contact the helmet body, so as to cause the helmet body to oscillate to form a sound cavity.